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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d24a2b21e58aba907f2d8ef8b7fa459923ba2af464a1e24e92d633bee4b8f49' 
  AND token = 'xspVNFLJ5OO52b+FmkBZNxf+P2w3gtedjC104d83Vl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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