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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4fcc6389ab452488200ada9eaa9753fbc72c8c8a9002b565e9e87d1bf4398f' 
  AND token = 'EIRacpaZfowH/ebBXMnsoOZMoFYFL0zDHgrPKkjG8GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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