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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da63b13ceb09fded001c335affc48cc98ba5483c587487b7dde610b628647de' 
  AND token = 'oKGsbntTZkhwPgJH0m5e+0y+Ufo3+l65jKanLqKU7v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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