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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c9aa79cef56f023cf11b262bd62f2ea949267dc3a84fe249e9a23d2d04ed56' 
  AND token = 'FrHssbQjLCCGC67yLVlfV/ZtzZtvakakFvEd216qrY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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