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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937449a450b7e9157007bb9e73517474c7b9eed63246850ee9fd5dc40095b034' 
  AND token = 'KwigI1iaIege7BZ6uz3s0iOaYx6CTUlZQhZtK81wcV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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