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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9764c3a9c7d66f1d2d4b4634443b304c3a7322c4d5dbf28fef984ee3536eb1' 
  AND token = 'XMXYt/E0SsPcGtuQWE7YEa2Nkp77muwSyVaaDs6yJVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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