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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fdf2eb7449bc073ea079c430b0410c94ae1f3795a73329d6cb0a9627cf1963f' 
  AND token = 'igklgoJ3wYBA5H7f5hXsGbl0eRx95FFIM0RucxY+etc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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