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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a507a1df43cfd3cd078d605fb51e00a2c90f188cc5187677c6095474b6b529ee' 
  AND token = 'TBEFcEevi5SrF8WPawsA6eRD7P4MME4av4rlpo36o+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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