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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7611a039b5bcd7300c941b89b2c88d55eec6e7336f62273bbfce7981585d9e' 
  AND token = '/FB6eg0xov8vhrGWiwhICKxWn/XWvv2Rla69V9katH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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