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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f16dc269a48bcb3a07a64d4f7615e102eba77ca52b5cf848b3451a976f990f3d' 
  AND token = 'O60HhvnamD0ROZ29Tl38PHEDtgwRRQIJEyRmssdaWW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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