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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff6368230a8aa184e08676f6617a8bdc4baf9182e581ec8e0f16abed38bca78' 
  AND token = 'IzrHQXUATy5f72rtaHihYiQMuOevHvp7YZ6g7mwE/AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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