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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05ea2517a00f12e4b078a5b74c1fa31a593ae005974a1780d247068280e709e' 
  AND token = 'L3ZWEw3LYTVctXBigQfCBNZNTqrA3BVGRo1k8JVZeNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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