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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9bbfa82eafeaa5a92f8a61108e30bf759a71eb2cba568706c79562946af13d' 
  AND token = 'OMuOWBDvkatEUnyhYSV6NPNXL+jbl6m0Y48pS7f/+r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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