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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffcf11ab55612ef10194f35b498656af76dadc0374e4a9718711fa54edeb78cc' 
  AND token = 'AWyPDS6OtlU1Ulhc3GI/WRHF9NN2uSNX/+mVrdZZqpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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