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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13f353d14f8410e61ad03848c4a265816decfb591d2777fe8150f5331d075c2' 
  AND token = 'b4iWjOvqLss+tXPFZyPUyc5hqeHZOAM36ubTpbI7nLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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