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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406f5621234da7f875f8c311b1dd4c7ffa2609f2c13824fa849d69452d69e529' 
  AND token = '2lNFpXj1AgDMtwlbdY4STlrxudn6dbAU2prz+ggXAhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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