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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe37d185b989b259dec04d43a0e092a76d62a51adcf4745e5a308ad80673336c' 
  AND token = 'e3KKEWIbE9ogezL9i9iIilSMRQRyZolSNlidE8gp64Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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