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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a3c08f74b9a57e31feabcfc7ce820d1e3b8908a5ba10e58ce0d4a55426164b' 
  AND token = 'mL31wK2WabbMzuFkY/ueVssPPTn+2NdA2OqJzXXijM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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