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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf78aebe12d9655d443e5730eae1b04888572a7b3d8532afc9f4f7d9df488a4b' 
  AND token = 'FRYuRjLi62cGZMVQoyPyL7Y0S76NddDoa2L2/8Y2lus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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