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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b96a3302c989962fb98e31c8831561b8795a8b710f553a40a59f6b23a2fc65c' 
  AND token = 'HRkwP3dgFecJDNBek0UZLzSNfk9NuK7YrsxsfwcVgic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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