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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e6c0d58e27d4c30e69bdacc7b13d50c9b9fc48c31e0f0ee724c07f4dc57cfa' 
  AND token = '40Uv26BgbMqxkYunIYioLmGcvAsE/dgsPj1quXnMYdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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