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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd9e93e47ffb80044aca0edf130e2fb665dd7ae2e74d41caaf31547f16dfb0f' 
  AND token = '6t4viJrLJ3rFj/mUPloqR20/7RPCQXmcBSH+UYwqtVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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