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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c919d93b4721a634fab0d06cb5fa606bc75b9872c6708dab278d7962aa594fb9' 
  AND token = 'DSXuyLLHB6p5cYr2MLwRfrSEfbnK78itfSarfzmO6Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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