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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb5d692146594aa1ee0cbaf940cff94e26a416892605a955b908d4443c7dd6a' 
  AND token = '7UdJrO+lIDrO3qW3XBYP85TI/ZXifky40oVpD9XMypQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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