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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '296d831f93ccc4bbfec0899a6e43aefddc0be5bfd0c0147506fa70ef81d12913' 
  AND token = 'JEuTOhAjLsc14xRa658rQ2jlVPVbqcQf63zXfgwLXDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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