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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1616f500b97381bd2412db774f5f1d52b538fcc1d4cdfcc67a91a0d38457dbe2' 
  AND token = 'kQb0w2dE8d3DZqfpwBlJvhCAGGaQB2KRc5auLLzRXb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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