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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400fceab3e09910eb40d7cbf4dda341d0fc0a7525f8d129b6ed1900055cc87e4' 
  AND token = '/159TnAxgVYv6KwPLep4QVJbI73nJZy+3cX1wqlkrMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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