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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b96e84db1df495d9c61ac20a8c26a085f229149743b74663c6732b20804534' 
  AND token = 'VLXbKyfq/aAU4FRwOqRW+GcT1EO2Ji/F/2ylOKESlz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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