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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fcf853317a93f4636323f1f10b81eed93df780a4a8e14e8ca87771b7286aaa' 
  AND token = 'RvdxGWonYphU8yapA5N30Qbel1cXF0FhX5fDDkXhSFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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