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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7430c0da06909a8b3d91aa98a51f55c46fc3fa30cf73d726035416c3d3eff8fd' 
  AND token = 'ESaTWuNr7ENnly5kYcChHaYYdRQ6J+YtafWXUya9OO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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