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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28aa55ce8e00c567ca4351837d140a06f350bcd00a9836c351fabde82f16a45f' 
  AND token = 'Pec65XLVYjU3rzGizeNsDDje6lmChXPTQJS2IQ2F8fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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