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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13062c12590b2de088ba649a07081a36a340e49c9563abc121b4124fbaab6968' 
  AND token = '9PiUYZhe/LzsLW37kdWJbZFGoXubLR/B4DTRMdVvLFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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