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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ef936ac41fdf5dcc3bba4c3c67b3527ac0757e91f1d67c1358731a8237ed54' 
  AND token = 'PrAQ/vP5ADaPEylN9y5JJRAHOjHjYAw9VresvPInWrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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