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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50b259f68b34cd5762b404c2f70adacc2fed27fb74a5682bbd07538d76ed37ca' 
  AND token = 'DLYmTUdmvZQvgyMvBb15vp2+ky7xP0s4QM9bLkHF4bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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