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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca4277f72d1f1fd5d990612337f0849be1ef137853c92f203408968f8a09737' 
  AND token = 'RRgh9r9EEE6vTKrrgYM5eMToPnSOt84OdyYVfi+4ztY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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