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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf8ff51229322c45b6503019e3fe5bcb86a53621109da76d480427191c89174' 
  AND token = 'R9fjl0tE8cak/6dPkv034gVGX3AXt3FVEwkEBku89wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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