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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a237e330c0e9faedcfba59eec65f1a05bf9342d01adfc0a90280fd41b9ffa7' 
  AND token = 'XtSHYpyrwmQK8J8xU7aJ3RYhQ0t7/H4deNcrSpzYR1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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