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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2534148b791b5797796973f6815bf18be87ba628d43e232156db5e38844d4f7' 
  AND token = '3B4NMBtTZYBB4PX1mikIL3WBNFfikJFr1c7BpKwl5SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}