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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc50a11003741885fe4c13e4f89e864fee15dc4ae25c419de517f7223a5db47' 
  AND token = '/0RwPBK16I9cnm03afh2G4Okzb0rwCwhwDApdKVtTv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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