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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9032f556fda99545fe22154a431e9264a99044fea9d190bf6cd2d73be2420e9' 
  AND token = 'rkZOCqOGt/jK4gmmSO848zXn63Epb0AKhIM0XmAKblM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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