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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f42267c851806755655c0ed353777477bd175239ffc278bb31394583ab2affe' 
  AND token = 'UhL0KgaodRe5aP16+We9cgqpVcaJURLfOjJFGC6LjSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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