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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050f3140045e8876f3c8e7500e8f4331ec874d27b29dcebd65f83786a68781c0' 
  AND token = '23FDNBlcDhsVH10rz62d2reUGfKG7+7Wd9A1Oz27yj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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