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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13106d0c3dd331c4ac1db559721454b5e6002e23ff3fddd42570a67ee15c45d3' 
  AND token = 'iMg1tmCyPPaV7XrWe2del20lz1xiQpc5vjo1DMwcSWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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