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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f28a82d3b0f4e2082cae333f1ede76d34920e0716f038dd9b24bbbbf40ed830' 
  AND token = 'LLQKxyfW22TTelPEDx1NqoSl8VkQEMj7uO0W4MxRV9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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