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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e164cb955a8e5cb61a09794e6617f4f5b901bbb15ef3bb452b1f2964e6e4061d' 
  AND token = 'oVmh4N0bg6k+8hRhPs1sxjYnZ7n+kzJ3uyr8lKEgZ0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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