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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c40e4b4fee6e1ff2eeab30f10fd587afeccae99b61b9db37fef63ab585b5d9' 
  AND token = 'geiVzfXqYurg5Dsj2Y/Un7FOS0ROc+1lSQbco1iu1Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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