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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8481779681fd1112a9db5dabb4d1151297d33f6d386c742c4c3bd2189e76095' 
  AND token = 'bx9T9FEQ7Wwo5cWD3XsoQ1PgLEd4iBSbL00wpCiP2tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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