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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ec2f292bc576a8ce0e786683733d55d1f17eb5445bd2e6249bbe0ce582abd9' 
  AND token = 'eX6QnNDq4KRvcKE9ORJZac4QdbM1Joz3NlU3b/waqqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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