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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00b5c28f0729e21e6770e23816bfc128a549ba91b55f5cca77d01e83100dc0e' 
  AND token = 'rXwH0RUy1kEIP2AsRhxolO3I9ma7XTu7+wzjYPa9hHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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