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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a141ddf3345eafbeb5bed87c9afb064b49e308dcbd0e84437e7195945c007b83' 
  AND token = 'p9I3V/YveUmn940WLJecE9drWSfOSJqqtlxay4nw5so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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