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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '846eea7b85f2a75986a80f01c78386a1cefcf1ed3f7ed1ae7df876068fa82bf6' 
  AND token = 'dGbFEz2tqHnW7nemVR1e2WGDN2gdRZJ1mkUiz3ufiiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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