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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4ff5f7ceb3e75c616a93001dd8315a07a09057a9e81c6b9e65392cd744a30d' 
  AND token = 'Kr/Kz86xyWKxbK2TiXaCCyCo5uIaI48Ewa7/c69Tb5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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