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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8bf082294d662941dc79c0b3ab0f317580342d95522881814cbe7c97621b90' 
  AND token = 'lGJdPis6rEv4pmxDEYO0MMRolPQIEYH+kSkZC5Dl/5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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