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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368311d1c7aee180fedb12130844bedaf97182926fb733d366eb6d2dfe4b0310' 
  AND token = 'gtIE+bKZL+h5gk5cBtG4Rprx4zTYX2eCToIP97mii68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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