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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244cb76b25e2faaef8d3ed0ceb608c5990ae5d6944667a1c7af06bde9123b096' 
  AND token = 'cVYg0IzrGM2zbmpuNxtePeDLEf1z8clOhkC3UPFp2ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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