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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f59a8dbda3914d30e7e1265b9ae28533f49b932a8a970524699d2384d23c3c' 
  AND token = 'M5dc3RfQ4k2YSc71ePb3R7hSpoQRDYg78t/37hHf83c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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