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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f058c7f2e7ce64707593b436918392d1a5bc92189aed232071896ae6d5632d' 
  AND token = 'JGZQtW1SnjxUXLYUUe62tWkffqXAH9Yo3I9dGDQ+Yoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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