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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a926b55ca7ab5aabe5205c6c8e90b0f8b2a3bb8e67a62217f9fb2a0a984fe9' 
  AND token = 'tv+E5i3wCqIBnhpZc2aEdipG1d6BdFQKD398gGDoypw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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