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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14ccc051a7bd0edab1f49b683f2060f36777890ea19604c8f9846d5595f46a9' 
  AND token = 'yq7a8w6tbmbANCggVFxQCvsqqK6LQrxrvZ1lbevftTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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