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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb93f8683828131dc1398c5d09faef80fd7e1a069ee69222af20f5fccd6d221b' 
  AND token = 'QjbmBFMsooL6z3IYmugy809tOWiy13Sd59trjm8oHmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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